So I've heard mention over the past couple years of this film called "Primer" that's supposed to be really good, but I never got a chance to watch it. I think I even remember it being mentioned here a couple of times. So then
This recent XKCD comic reminded me of the movie, and since my roomate has a Netflix account, I looked it up and yes, it's on their streaming list. So I watched it.
Then I said, "What the fuck?"
Then I watched it again. Then I went insane.
Now, after two days of seclusion, diagrams, and insanity, I solved it. This is the only solution I can see that makes sense.
The key to it all is when Aaron2, in the voiceover says, "The boxes are reusable". What does he mean by this? Of course the boxes are reusable. After you've traveled and lived out the day, you turn it on again and reuse it. Oh no, dear friend, it is much more frightening than that. This is not a sci-fi movie, it's a horror film.
Imagine you have a box. You turn it on, and you wait twelve hours, then turn it off and climb inside at the B point of the curve. You then of course wait 12 more hours while traveling to the A point of the curve, then exit the box at the point at which you originally turned it on. That's how it works, right? Abe explained this to Aaron simply. But he didn't realize something.
the box is reusable. What happens if, after making this first 12-hour trip backwards, you wait eleven hours, and then turn off the box and climb in?
The box is fucking reusable.
I now present to you the accurate, and only logical, timeline of "Primer":

You may go insane now.
Edit: Hmm, I guess either something about making it in MsPaint or my state of mind right now, but I can't make it show larger. You may have to copy the image locationa nd open it in a new window to read.